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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '861b93a73e52aab26e804f7671955c9c3349dcf62b2f95dea56eca014add3d48' 
  AND token = 'P8+nt/gbA8ptxAe9Y9YDtTg5ot9VScWezY30kdGZb84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}