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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '602b48ddd9a617af22fc1a765c2c8f4010eb69bd086196499164e835aa47f502' 
  AND token = '09fpqPmEdKBv6lLaIsRz57cOqSf57fvquGrVdGt8m/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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