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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '026ed586de2b5e1571b66f378d5c9ca5cba0e9f230c1cfaf627a704d1a5a3398' 
  AND token = 'K5wVyUImcKPgwUc5GAXrQ9ZhLr3sr3UR+dKa313l52Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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