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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7da1b3972ae9a41a2cfa04c1bee4973abe86842eb9198f3ab02ff795fc40023' 
  AND token = 'dH/alFQdTJziX7a2DL3UG0thZkjRhWyLFvgfL15llI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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