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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1daa5a525ca61b5148c378c1ca0c2d94c8db0e1cf2d1b4fc7c1ef737488dc2f' 
  AND token = '8/QWLSatlfr9kR2M7iqApo4sTkmr4JuCR8t4V2uUDlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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