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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18bab41391f6786612d0992c42fc3eca1a2d4ccb1c82d90478c0aae078ba9f94' 
  AND token = 'a6NIhR32Ggp583RhOJ5ucRBL1hLs6b4i5GDZrnDm8J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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