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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7c13220feca26860c82663d1c44e7f476b9843c0e123080dcfec3c50b02bad9' 
  AND token = 'n1bquTPIZVwgC4q5y+PcycmDNjj7S5BonDfeFCs8Hk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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