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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63ad30998e9e5db82c529623307f4db4f22960785f6574786793a8a4143377ac' 
  AND token = '4ibBbLBcKgau0E+yfWU8j90wv/GRxIRpoi9FDDDx8zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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