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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a86f2b2574c57f8470a182ec04a444100292d33ac1939d9dffb9dd4812d50ef' 
  AND token = 'BwJDbbzFgy+b0B/uxKiB4s44Hm+ysd6VblJkEPb7KsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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