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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02c3e4d87aab39d3bc82e5f66808c61cf449c08e4112f8f0e69998366836efcc' 
  AND token = 'gzzipWaAMRyudJsMI03A5Q4HQiZbB+sLZQLAS26+vNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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