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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2073d483fb552f7bc03f352a06050877c4c84fd57134d42c233664b2ef655ac' 
  AND token = '0cHYVHyM1JdpdW9kgzb4K2LEllD/j9toKiqjTftN16M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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