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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8afb21a012493b81574a66edf8488c7f5984b6ca67706660362079c55163e5fd' 
  AND token = 'Yvi3v7vlWrvDUwBSvnv0GP1HFDnW7rPTKkQ2uF0Hh9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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