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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7d59540de241f19045f0405b1b3a28459c089848495ede9285eaf2dd8eceee3' 
  AND token = 'CLHvNEdlNooLirWrOmdstUoIHIHVqhG4KM9JHm+1qbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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