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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4e69b1c6e0a84a939368fb0869f59f2639f5dff3cc0b0b5f27d46fb1d82b763' 
  AND token = '6gpjnm31expBaD31n/34Bstxglvipc052n777bFYo9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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