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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3e7b479b758612c0645cadf3e349e3de22e1ab8f0794706741b3289aa1fdce0' 
  AND token = '2icRNEKz60mopSkm1Pmern8iLUM0ES2Af4T3BQrbQWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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