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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2838a566a2b98c1df61cd4c8c998f5fd2b3d2a18a02a39888ee1e6f20c2537e' 
  AND token = 'JHskLjse6InLPcs0HLC/cV3G6rt5n8ser/QdJfrtQiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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