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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47fbe2183ce5aad76f5f0cd2428b0e7de544288770059104273823dc80814a13' 
  AND token = '9tE+BhDuC3bzjIqzivZ2cNW8icHMVhTSaeBmf7PFs4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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