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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20f48c0d2579bc1b053177593977670d93fe1f2d646685733a10b170b2f16e01' 
  AND token = '7lwI/Fkojx/L4cdUgeS29D+oQnz8XsFFmruB18CXm20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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