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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5aef2e7a6e0de844249ef2c50628e6a3c563df7020a226343617fc18f529e52' 
  AND token = 'ZYY9soa87zqWdYIa/btO5fNdm/o0IECaMNx2Ih745Ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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