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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '796457236d79f14e112c5c0e15f7832ed2c0c77b93e808cb8518da0cffd1e8b0' 
  AND token = 'MoHLC8/sEhQHjwrxR/oNAn8z6wadOPPHayELpDsvXZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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