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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbc6d14fd988fe2978240f11b85899abcc4824f0ccd848072b6ef29a09f374e1' 
  AND token = 'LNiMVTwzKXILlBoKTkDjIqX7GyVZOPRETPL14JmdBV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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