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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9daddbb38045d0a22f26360c75dfa72fd4d190cb828657c1482dfa5968946304' 
  AND token = 'iAvF/0ekF1eob/UnSnvaLcHqFpguc8Da+hXstPN1/Kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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