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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7ba885f11b7ae8823f8a775362a28fdb7c753e2d060c9339760ca9e757336e8' 
  AND token = 'B4LffcYP0pcUr4KKT1aDV+gVJA7/l4SL9AU9eN9y/x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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