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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e5ca2e2e2fdb67762a624c0d74386fbda5a5f15bcadadcc8f4f5f856dcf8432' 
  AND token = 'AgJ27tFyw7zl7tfg6L6JDW7rGuDQYEu+XuQLy12hL4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00148

JSON explain

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