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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf854edd6d45b094e6d002a83ade7dbb3de0de5895402472893abff1ec917738' 
  AND token = '+DaRr/W5lw36YrGmNh7xEWZoKA0Jy4aHCS/R1PYxH6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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