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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eabb6a68db48e932e73d85f8c5ff575be440c6304afb25a0a9d56c163d4fcfb0' 
  AND token = 'vRbbKjZRgwsJReomRS9G7pW8mdOVOZsTHxMRWWtVnfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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