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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e2c8ebef34583c6ae3f42e1a97543f221141ccdeebdcb567975e2b5345480af' 
  AND token = 'VYsU8aA+TkFFUttVyUJ3b6Cx/lm43FjODW7SqZArr/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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