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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7ba72654f89c0e18f612d3634b7478865538cce9e19b95337cbf6036d6a004c' 
  AND token = '1RhOQ8H63s0mOm1rsRzUlNoim61YXn03PCZ2aNOZ/Iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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