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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '070f53b38739e2424f5380da4615156306208030204362b11815ae65598e83f2' 
  AND token = 'WTVOk+82jjejtn40p1IMAi0gp6dpP+BHE49H6lxsyrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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