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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6add187740c6b1fb46a7414fe38bd99a1764a3b750148d54e9325f2a935d01d3' 
  AND token = 'RNKOM+fby5Uf48r2X14MwpyXl8QdvKd6DxPORDqOpgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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