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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '348d7f438c7bd86103dd41d6f4998dd3ce5cb385c86b91b321b6e833c8efe79a' 
  AND token = 'bLVhndpz+LMHUQTdWbtbb/GPS+AkUOrbcgVuNdmhdhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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