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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '205f0f732ec0decdef739af07ef6a5f6a311fdb25cf4c38ceee2cec338521e8d' 
  AND token = 'iXUxfCG0WiDPehkbZFQtizuE85n6omnSWC0256sFFtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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