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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bad0e50d099bbe6bc7494eea813526a80e1e4e8f3401f43b0b929b00be60a843' 
  AND token = 'vsMVB7U8RnGzk6MsCqELdh2Q7xkOFskUxMO+hlp8iXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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