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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '334d0f30ac185863b4fcc658bdb0d07736193b57fc88e0a54ffae875dcf30979' 
  AND token = 'bRpBpka0Pj26LBFy0X1NPhN9SARxxNQ0tK5g/sfCqSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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