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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96fede62d44deedae0c416c4162f38f0effdcf5c399ca0cc2a0cd1866d307fb1' 
  AND token = 'CKN0qx5UAnLJpeJ0tXkmTg9UxQQ8JdBS3G03yLiUFLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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