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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ee7a2e2e412c7411a4edca6f715f5b668a7b7b62a5313da97e62307e1ecdb22' 
  AND token = 'UxTt2e84PRSbgKJgB0ZAZUddqbxfxugN59n21j6iuDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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