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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55626b38360df85cfe6274b6df216de79f22f7b2eb092203a82150b53cc7a6c2' 
  AND token = 'rMrYvIowti7tXETVx0i/9IY1wpz90ts1iQOKUq3Id+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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