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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c68634283c9c9ef985578741473c3a9ce9379c8f05fce0f9800686e3b8eb7cb3' 
  AND token = 'NW5nnEeBmVB/wD7305jFNJ2l5+y/2axVosCG28wh0B8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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