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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30a0a982a604e26db3c9dee6b0dbb9662af95dc9a18a96a629bb3b7431b0db26' 
  AND token = '+5tn11jAeS8FVbEWLnrmRS5TBQnXnjUkpaFz8dMdpEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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