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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19071dde227a5a762bf38155a071f8bc554df3c77be61701e728f584bba40b3d' 
  AND token = 'HBezPKgy0sJy6E9y4Km01FgNrgbGD9gU8xLZ/Hsetwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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