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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af2062943fccd23dde5ba24a108fa1f96b04a2bc1018b0cbfb7e2b8ca0c19816' 
  AND token = 'LMJvPMvQ5bbnhwxZDrD67pe5XfkmwbqrFPB1vo8CC10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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