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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcf3f1752f0567b39afeaf94bf4746863a747bb5ed176aa58df6da81e2686d6c' 
  AND token = 'L0c4c8iMEItlzh6geARSFZHi913EVM0s3rflKowKYBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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