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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4ffea86b4a4b0afd277b9a9d922e87ebcf479ec7eee997767748fcffa961a71' 
  AND token = 'cDdcPPMyPqC5/T56ouG8g8B2fkXrnLOacSSu0tFwhd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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