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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0ab73ef8f67dd5abe8ae18c42c515f5410557095fa9192e1106f20b002851fa' 
  AND token = 'GiKHuoZisj5aRwtISzO5BB1an+OTlZHMVcpEy/mkcp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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