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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5718b1d024aab95be13aa0e2d4af5717dccdf4cb0c8769cd86f33d0ba956f42' 
  AND token = 'AFHb8uut+a2KCHXgmAFuupbb1w4dfaxIS49GzhbyGfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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