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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b20e84c58bec7eb1c9f12d9d6ca0426a2f95a84fb0e93705655863ff765f5065' 
  AND token = 'ffALgEQ+JftW6co/n/qWm2Jdtg+oWsxcDs0/4g4eK6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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