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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '420f0ecc412a85178f2f98d48e89c2f33e18beb79ffa579ef415ae10cceda03b' 
  AND token = 'meagwNVG6Hjgo8NmyVDiw/ZVAdWUT/qAQJkOfwcjm6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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