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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaad75f740028eb81fa4801b6574c30bed1fe43727c3d3b6b696058745dc77aa' 
  AND token = 'y/03MPozYYLtUBoTLxXMcHfo1PzvpKGuGN7rix4WA+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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