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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a44b8013a54dc3829791c163b560c4fac855e0093575b333a8cde87a2468ce59' 
  AND token = '8v4uAQA9o4F1n0VfTN96dwsqLcep7BJZ9htYf38raho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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