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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87dbb3dc07a32b2af4d435e7677be81146ba9b046906fe9dee9b5abdd6944056' 
  AND token = 'A0MEaAXb3qJifaRBUbWgiJY74+TpOZLoI/eDGT9ULd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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