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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7215db868f562e3b944a55e9ec9b839001ba5b43d3f3cb360590b8bd3de6880a' 
  AND token = 'M81/UckI6klJEG/53Kcc/jIEw2KZM3nZ8x+TrSV/8LU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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