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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4743db7771f433a7405a4abe9cbeca0c2d091b0818dad6cf2971c00c2d2670a' 
  AND token = '9LWRZxO3S4IP23LZfLZG08Gm0jfCYps+cInoOb/WSX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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