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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '954da109ba1112ae903983cc66504945a7bb6037ccdf802153d88b015a0ca607' 
  AND token = '8CACqeyLuBzvtQvs4+uoejirB18jbDXI6J2r2ynsS8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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