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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89a7b7199660ca421de31486a7a2966fc1fdb7bc33efb2b597add604c4446a32' 
  AND token = 'CpT1gRT6v23FR02BYKetNaEh9Fk5WVeSiTFL9ohPvsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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