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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19cd289cc658c08b572a4741c4aff6ac09d43c1132e1cf9388467410d53f8dd8' 
  AND token = 'O6In4ld6Cy/wqlMLpCkOP5YRcg97peJtvK9p+ZK9I1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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