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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3eb442906dc88604fbb37e9454ff72d97eabd6889cc721554b3b5796c6a29fb' 
  AND token = 'q4gS7UZyoc8Ru5uWGFvaDfDRmk30d1PQSqGF640Zvik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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