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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1e975e8958dca0b7f942df07ab1eb04116ea7aa0b9c83fc070bf874464429bc' 
  AND token = 'dcebBOniTHT7LyRvtE9Anc4Th41mDA5yiMXZ7bN6fHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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