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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0ee99f183d1a07e973a1bd50963a34babb9fa01fc539730e7e1de5a99bed535' 
  AND token = '8wR3h/aeWr88aMX+nf4bpyfMXrQZq5d2hKqe7sqTKD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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